Fire stop



FIG. 1 is a perspective view of a fire stop showing my new design;

FIG. 2 is a right side elevation thereof, the left side being a mirror image thereof;

FIG. 3 is a plan view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a perspective view of a second embodiment of a fire stop, wherein the only difference resides in the elimination of the central front piece. 

The ornamental design for a fire stop, as shown and described. 